These are the top rated real world Python examples of PyQt5. [SOLVED] QSignalMapper and QStandardItemModel; If this is your first visit, be sure to check out the FAQ by clicking the link above. mapper = new QSignalMapper( this ); connect( mapper, SIGNAL(mapped(QWidget*)), workspace, SLOT(setActiveWindow(QWidget*)) ); I read QSignalMapper can be replaced with lamdas but how in this case? If i understand right mapper forwards all the signals from this to workspaces active window?I think in this case QSignalMapper is the way to go. QSignalMapper is the best solution to connect multiple signals to the same slot. QML < /C> >从C++类<代码> KoBoAdMault. QSignalMapper can not be used for that, but the class is quite simple to re-implement and specialize for your needs. PreferencesRole. ) which adds buttons to the vertical layout dynamically and also the widget to be show to stacked layout. QtCore. This signal is emitted when map () is signalled from an object that has an integer mapping set. You could do it with QShortcut fairly easily in code though. The class supports the mapping of particular strings or integers with particular objects using setMapping(). This is an overloaded function. Unfortunately, all attempts of making this used QSignalMapper successfully in a similar situation. Im creating QSliders and QLabels in my Program and i want to connect them so when I'm changing the Slider the Value should be shown within the label. 2. It is provided to keep old source code working. This function was introduced in Qt 5. If called outside of a slot activated by a signal, -1 is returned. You do not need a QSignalMapper if I understand you correctly but its difficult to tell as you hardly posted any code. QSignalMapper is used to connect multiple signals to a single slot, and QDialogButtonBox already has a single signal that is emitted for all the buttons: clicked (QAbstractButton*). It also lets you associate ints, QWidgets, and QObjects to a QAction. QProgressBar { border: 2px solid grey; border-radius: 5px; } QProgressBar::chunk { background-color: #05B8CC; width: 20px; } This leaves the text-align , which we customize by positioning the text in the center of the progress bar. You shouldn't need to use QSignalMapper with QDialogButtonBox. QSignalMapper didn't help, because all the properties are in the same object. . This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Hot Network Questions Who or what was the inspiration for Jessica Rabbit?QSignalMapper类可以看成是信号的翻译和转发器。 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。 QSignalMapper类的功能核心是要建立一个从原始信号的object到需要的数据的映射（setMapper函数）。void QSignalMapper::setMapping ( const QObject * sender, const QString & identifier ) [virtual] This is an overloaded member function, provided for convenience. A combobox may be editable, allowing the user to modify each item in the list. The use of QSignalMapper is not necessary in Qt 5, and is optional in Qt 4. QSignalMapper; QSize; QSizeF; QSocketDescriptor; QSocketNotifier; QSortFilterProxyModel; QStandardPaths; QStorageInfo; QStringConverter;. and I assume you initialized the "signalMapper = new QSignalMapper (this)" in the MyApp constructor. You can connect a signal to a slot with connect (). When I'm doing a mapping and that the argument passed to the function is an int, everything works just fine, but when it is a string, nothing happen. So this is like calling doSomething in the next event. Also the fact that i was using SubMenu as argument to setMapping , where as MenuAction item should have been used instead. The QSignalMapper class bundles signals from identifiable senders. connect (signalMapper. Just right-click any dock title-bar, or any tool-bar or menu-bar. This is useful for QML applications which may refer to the emitted values by name. QSignalMapper does not provide functionality to pass signal parameters. See also setMapping(). The Simple Tree Model example shows how to create a basic, read-only hierarchical model to use with Qt’s standard view classes. Here my QToolButtons are in contained in QList. com if any conditions of this licensing are ** not clear to you. It allows mapping one or more signals from different objects to a single slot. : The QSignalMapper class is provided for situations where many signals are connected to the same slot and the slot needs to handle each signal differently. This class collects a set of parameterless signals, and re-emits them with integer, string or widget. [signal] void QSignalMapper:: mappedWidget (QWidget *widget) This signal is emitted when map() is signalled from an object that has a widget mapping set. 送分童子笑嘻嘻. 15, QSignalMapper::mapped had an overload for each of the four types of the single argument: QObject*, QWidget*, const QString& and int. The code below returns no error, but just the act_int. For a description of simple non-hierarchical list and table models, see the Model/View Programming overview. The class supports the mapping of particular strings or integers with particular objects using setMapping(). The class supports the mapping of particular strings or integers with particular objects using setMapping(). Related. see documentation: This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. queryable and designable object properties. The Map Viewer example shows how to display and interact with a map, search for an address, and find driving directions. You can rate examples to help us improve the quality of examples. The Text Edit example shows Qt’s rich text editing facilities in action. The signals and slots mechanism is type safe: The signature of a signal must match the signature of the receiving slot. In this way the slot associated to the signal mapper is invoked only when the checkbox is checked and not when it is unchecked. For more information about how to use Maintenance Tool with the command line interface, see Get and Install Qt with. 408 4 4 silver badges 8 8 bronze badges. The class supports the mapping of particular strings or integers with particular objects using setMapping(). I have a QSpinBox and I would like to connect it to a slot with 2 parameters when clicking on the arrows. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. The QSignalMapper class bundles signals from identifiable senders. QAction. 15] void QSignalMapper. Combo Widget Mapper Example. I suggest that you try copy/paste the following line to replace yours:I know that i can use QSignalMapper to call a slot with different parameters based on connection. But in Qt4, receiver must still always be a QObject. 1 Reply Last reply 10 May 2018, 05:37 0. More than 100 million people use GitHub to discover, fork, and contribute to. You can trigger behaviors in response to user input, such as button presses or text input, or events in your own code. The method has this signature: int QObject::qt_metacall (QMetaObject::Call call, int id, void **arguments) Call is the kind of metacall: slot, signal, property read or write, etc. 3 Qt: the signal handler is not called when the signal is emitted. The basic syntax is : QTimer::singleShot (myTime, myObject, SLOT (myMethodInMyObject ())); with myTime the time in ms, myObject the object which contain the method and myMethodInMyObject the slot to call. This was particularly true in older versions of the software, that is, and relied on Qt 4. These functions are part of the Qt Concurrent framework. 使用QSignalMapper确定信号的发送者（针对多个发送者的情况） 如果有多个对象都可能发送信号，并且我们希望根据信号发送者来采取不同的操作，可以使用QSignalMapper类。该类可以将多个对象与相应的信号关联起来，并通过sender()方法确定信号的发送者。Many examples show how to do this with QSignalMapper, but it is not applicable when the signal carries a parameter, as with combobox. QSignalMapper is used to connect multiple signals to a single slot, and QDialogButtonBox already has a single signal that is emitted for all the buttons: clicked (QAbstractButton*). While it still exists, it's rarely used, and is mostly considered obsolete. The class supports the mapping of particular strings or integers with particular objects using setMapping(). 实际上有一种其他技术可以用来获得包装函数和参数的效果。它使用QSignalMapper类，其使用的示例在第9章中显示。 在一些情况下，可以将槽称为信号的结果，并且在槽中直接或间接执行的处理导致最初称为槽的信号被再次调用，导致无限循环。*/ QObject * QSignalMapper:: mapping (QObject * object) const {Q_D (const QSignalMapper); return d-> objectHash. mapped [int]. Connecting C++ Objects to QML Objects. Several years ago I wrote a short piece on QSignalMapper to give a quick example of how it can be used. Instead of using QSignalMapper, which forces you to create a custom STRUCT_WRAPPER, try using the QAction::setData method, which accepts any QVariant. Qlabel label; QSlider silder; connect (slider, SIGNAL (valueChanged (int)), this, ChangeText (slider, label)); void ChangeText (&slider, &label)To associate your repository with the pyside6-examples topic, visit your repo's landing page and select "manage topics. clear () where LineEdits is your list of widgets. PyQt: Changing cursor when hovering a button. Это лучшие примеры Python кода для PyQt5. key (object);} /*! Removes all mappings for a sender. Normally it should not but anyway, nice you found out. Damn! So I did, I was guessing at that point! :( Now I know better, from the SO link I gave you :). The object's mapped widget is passed in. – Qt Base (Core, Gui, Widgets, Network,. setBuffer(s) myNode = coin. Remember that from Qt 5. 1) QSignalMapper maps a QObject* sender to a (int, string, QWidget* or QObject*). I would like to select file via file dialog and upload board with selected file by upload button. Just right-click any dock title-bar, or any tool-bar or menu-bar. The QSignalMapper class bundles signals from identifiable senders. I can't recall if the parameter needs to be exact in this case for the connection but it may be a factor. . toString (); QSignalMapper * signalMapper = new QSignalMapper (parent); //this is just one of many trials to get this working, i hope you get the picture connect (combo , SIGNAL (activated (int. h" #endif // QT_H #ifndef QT_NO_SIGNALMAPPER class QSignalMapperData; struct QSignalMapperRec; class Q_EXPORT QSignalMapper : public QObject {. 3 Answers. We strongly advise against using it in. mappedInt(arg__1) #. As such, QSignalMapper is not deisgned to transfer parameters into other slots for you. map(sender) Parameters: sender – PySide6. We had to tell the compiler with a static_cast which overload to use in the connect statements. MainWindow::MainWindow (QWidget *parent) : QMainWindow (parent) , ui (new Ui::MainWindow) { ui->setupUi. Simply use a QMap<QObject*,ValueStruct>, where ValueStruct keeps your arguments. QSignalMapper with signal argument and extra argument. There are the ways to solve that: 实际上有一种其他技术可以用来获得包装函数和参数的效果。它使用QSignalMapper类，其使用的示例在第9章中显示。 在一些情况下，可以将槽称为信号的结果，并且在槽中直接或间接执行的处理导致最初称为槽的信号被再次调用，导致无限循环。 Worth noting (2018, Qt5, C++11) that QSignalMapper is deprecated. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. It only want to work with integers. With setMapping the connection between the sender and the value is set up. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. to get the ID (can be 1 to 16) and know which ID did kick off the singleShot. currentIndexChanged Many people suggest it can be made with lambda. Every slot has an id. QSignalMapper does not provide functionality to pass signal parameters. plist JavaScript jpegtran jQuery JSON Leaflet library macOS Mac OS X maps OpenCV open source optimization php point cloud QGraphicsItem QGraphicsScene QGraphicsView. 1. Calling QComboBox* combo = (QComboBox* )sender() in the slot fails, presumably because sender() is now the QSignalMapper. See: QMainWindow::createPopupMenu. self. The QSignalMapper class bundles signals from identifiable senders. I can't get the signal mapped (QObject*) to trigger. I have 4 QLineEdits and 4 QPushButtons. About QSignalMapper's slot/signal names, agree they can be somewhat confusing: map() is QSignalMapper's fixed "receptacle" slot name, setMapping() is the important proxy/augmentation data setup, and mapped() is the fixed outgoing signal name. See also setMapping(). While trying to connect the buttons' clicked () signals to the textEdit to display the relevant state, I got stuck on an error: Object::connect No such slot QTextEdit::append ("move state") Object. Stack Overflow Public questions & answers; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Talent Build your employer brand ; Advertising Reach developers & technologists worldwide; Labs The future of collective knowledge sharing; About the companyTextEdit Example#. Now, consider discarding those cards, to draw new ones. Cards are drawn from a deck and displayed on screen. Since your "load" and "return to main menu" signals are being sent from the same sender object they will be mapped the same way. 1. A signal mapper is constructed and for each text in the list a QPushButton is created. map () being called from a proxy rather than new-style connections. connect (self. QSignalMapper with signal argument and extra argument. The. QSignalMapper is a class in Qt library that is used to map multiple signals to a single slot. Viewed 82 times 0 I'm making an application which will be able to program my board. QObject. Instead of accepting an int as an argument, use sender() to determine which button is the source. – Detailed Description. The QSignalMapper class bundles signals from identifiable senders. The QSignalMapper class bundles signals from identifiable senders. Eliminate QSignalMapper entirely and connect the button's clicked signal to mySlot. In other words (from the documentation):. QSignalMapper. The parameter it passes in its mapped() signal is the one that ★ X Window System users have two clipboards: the default one and the mouse selection one. Update 2: It worked after the correction suggested in the solution below for QSignalMapper. It is provided to keep old source code working. QSignalMapper类可以看成是信号的翻译和转发器。 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。 QSignalMapper类的功能核心是要建立一个从原始信号的object到需要的数据的映射（setMapper函数）。 Much cleaner code and it’s easier to maintain and modify. 详细说明 QSignalMapper类捆绑来自可识别发送者的信号。此类收集一组无参数的信号，并使用与发送信号的对象相对应的整数，字符串或窗口小部件参数重新发出它们。该类使用setMapping（）支持特定字符串或整数与特定对象的映射。然后可以将对象的信号连接到map（）插槽，该插槽将发出与原始信令. . 2 QSignalMapper with signal argument and extra argument. ** ** Contact [email protected] QSignalMapper is a member variable, and each QCheckBox connects its clicked signal to the map() slot of QSignalMapper. This slot emits signals based on which object sends. Dynamic Signals and Slots by Eskil A. After deeper review of the code flow I suspect that you wanted to connect mapper to registerProcess() slot instead of pidOut(). 1 Answer. map) Tonight's PyQt snapshot will be smarter about finding a usable Qt slot before deciding that it needs to. To handle the different types of data associated with each option, then in QAction the value is stored and accessed using setData () and data (), respectively. If you need to know both value and sender you either can use some internal class mapping, or use QObject * mapper and then cast QObject * to slider. andrewhopps @hskoglund 2 Apr 2017, 16:14. Much thanks to you both. 1. Detailed Description. lambda code. should be. The following example uses old-style signals and slots connections to explicitly specify the signals to be connected to slots in a Python subclass of QWidget. QSignalMapper taken from open source projects. Qt reports if the signal and slot cannot be connected. Returns the meta-method index of the signal that called the currently executing slot, which is a member of the class returned by sender (). Once Qt is installed, you can use Maintenance Tool under <install_dir> to add components and to update or remove installed components. /***** ** ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies). _mapper =. The quick-and-dirty way is to use connect () as usual, and then in your slot method, call sender () to find out which object sent the signal. Learn more about TeamsQSignalMapper:: QSignalMapper (QObject *parent = nullptr) Constructs a QSignalMapper with parent parent. QSerialPort provides a set of functions that suspend the calling thread until certain signals are emitted. You're just not checking for the double click event. 3. Here are the examples of the python api PyQt5. QSignalMapper does not update parameter after choosing file. (Going forward the goal will be to. Using Maintenance Tool #. lambda code. I try to migrate my code from pyqt4 to pyqt5 and I have trouble dealing with QSignalMapper. A command button is rectangular and typically displays a text label. If you need to know both value and sender you either can use some internal class mapping, or use QObject * mapper and then cast QObject * to slider. #. With separate slots, class signature change needed. [slot] void QSignalMapper:: map This slot emits signals based on which object sends signals to it. Orange widgets are building blocks of data analysis workflows that are assembled in Orange’s visual programming environment. When this loop is done, processEvents will be called again and in that the doSomething () will be executed. This function was introduced in Qt 5. void Messenger::addToActivePanels(std::string& channel) { activePanelsContents = this->findChild<QWidget *>(QString("activePanelsContents")); pushButton = new. . This action should be placed where the “About” menu item is in the application menu. 3. answered Sep 10, 2012 at 13:28. A collection of tutorials with walkthrough guides are provided with Qt for Python to help new users get started. It is provided to keep old source code working. I think you can use this method: [protected] int QObject:: senderSignalIndex () const. Sorted by: 3. mapper. . The class supports the mapping of particular strings or integers with particular objects using setMapping(). But most of the time I have this error: QWidget::repaint: Recursive repaint detected. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Updating class variable Qt signals and slots. When the content is changed using any of these functions, any previous content is cleared. Detailed Description. private: QSignalMapper *mapper; In my cpp: //Constructor: mapper = new QSignalMapper (this); //Init function, called by the constructor connect (mapper, SIGNAL (mapped (int)), this,. When value has hanged, QDialog could emit another signal with information of slider id and new value. – jonspaceharper But this removes all knowledge of the original sender widget. QSignalMapper类内置了一个Map表，将Singnal和参数对应起来，然后多个信号关联到Mapper上，由mapper负责管理，并且mapper关联到槽函数中，将对应的参数传入槽函数 The code below shows my attempt to get several movable VerticalLineSegment objects (derived from QGraphicsLineItem and QObject) to signal one (using a QSignalMapper) another when they move. QVariant or a generic interface is not provided by Qt. cpp file. Tu verras que. snap1. A PySide6/QML application consists, at least, of two different files - a file with the QML description of the user interface, and a python file that loads the QML file. Ask Question Asked 8 years, 2 months ago. In keyboard. txt"));A. My. PyQt provides access to all the available. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. So I'm dynamically creating QPushButton objects and then mapping them to emit a signal. 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。. Before Qt 5. Fix:All of the button's clicked signals will call the same function, passing to the function the associated QPushButton. However, the look of a QLabel can be adjusted and fine-tuned in several ways. Unfortunately, all attempts of making this used QSignalMapper successfully in a similar situation. We strongly advise against using it in new code. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters. PyQT: adding to QAbstractItemModel using a button. When trying to add a derived QWizardPage with a custom Q_PROPERTY in the constructor of a derived QWizard I get the following runtime warning for my minimal example: QObject::connect: Attempt to. – SPlatten. # Example showing how QSignalMapper can be used to manage an arbitrary # numbers of parameterless signals and re-emit them with an argument # identifying the sender. Вы можете ставить оценку каждому примеру, чтобы помочь нам улучшить качество примеров. 1 Answer. addObject("Part::Box", "myBox") s = box. signal keyboardOpening signal keyboardOpened signal keyboardClosing signal. QSignalMapper extracted from open source projects. Imagine changing buttons to QComboBox or any other UI change. 应用场景一般是 ：有一些信号，发送的参数. Qt Library. The technique involves reimplementing the qt_metacall method yourself. . Method Documentation QSignalMapper. partial, lambdas, or custom signals. because you wrote it in your first answer to this post. clicked. Consider a card game. The Camera Example shows how to use the API to capture a still image or video. So when you have many items you can QSignalMapper or try something like next (there are many ways to do this, I give example with small code): QList<QPair<QCheckBox*,QGraphicsItem*> > pair; //fill your list with all QCheckBox. Hi, I have a slot that I'd like to connect to. More. But I am not able to exactly place, which signal is to be called for which slot. 它可以把一个无参的信号翻译成带int参数、QString参数、 QObject* 参数或者QWidget *参数的信号，并将之转发。. When you receive a signal, map (), look at QObject::sender () ( link) as the key in the map to make the emit in your turn. ) Share. By voting up you can indicate which examples are most useful and appropriate. I'd appreciate help as to why the VerticalLineSegment slot updateX is not triggered. QT之QSignalMapper（可以理解为转发器，多个按钮绑定到一个Edit上，且能分辨。每个单独连接的话，反而麻烦） 简述 QSignalMapper我们可以理解为转发器，此话怎讲呢？比如，按钮点击的响应槽，绑定到QSignalMapper上，QSignalMapper收到按钮的点击后，又通知到另外的控件. map ()作为. Below is an example of the use of QSignalMapper in Qt4/5. in the class definition . Update. The reason why your QSignalMapper code doesn't work is probably because you are connecting to the wrong overload of the mapped signal. Instead of individually creating each QPushButton in qtcreator & qtdesigner, and individually creating each on_clicked signal function for each button, I am trying to apply a QSignalMapper. You can only use the signals that exist in QSignalMapper. The QSignalMapper class bundles signals from identifiable senders. This is less costly and will simplify the code. setMapping() overload which takes a sender and a QObject as. 按钮被点击触发信号激活 QSignalMapper的槽函数map ()，map ()会统一释放一个带有标记的信号，该信号触发定义的按钮槽函数，根据标记（ID、 QWidget 、QString）去判断到底. Publish/subscribe to typed events (Could even be QObjects) I was thinking of using QSignalMapper to tag the "named events", then re-emitting from a slot or connecting the publishers signal to the subscriber's signal. c++; qt; signals; mapper; Share. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. QSignalMapper. The workaround is to explicitly specify a signal that is compatible with map (). from pivy import coin import FreeCAD as App box = App. hierarchical and queryable object trees. But I am not able to exactly place, which signal is to be called for which slot. I know that the QSignalMapper::map() signal has no arguments, but I don't know how it is working with old syntax. The QSignalMapper is used to re-emit signals with optional parameters. We strongly advise against using it in new code. Sorted by: 1. ** Contact: ** ** This file is part of the QtCore module of the. For example, we change the border to grey and the chunk to cerulean. This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. Qt provides this, by combining the speed of C++ with the flexibility of the Qt Object Model. Mac OS X also has a "Find" clipboard. (Going forward the goal will be to have the VerticalLineSegment s in. . QtCore. I have simple application, a calculator. I have had a look to the logfile of our application, started/cleared yesterday morning. Algunos amigos pueden preguntar, ¿por qué es tan problemático y. The QSignalMapper class is provided for situations where many signals are connected to the same slot and the slot needs to handle each signal differently. The class supports the mapping of particular strings or integers with particular objects using setMapping (). This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to the object that sent the signal. According to the QT documentation QWorkspace should be replaced with QMdiArea. But the compiler complains about no matching parameters. For any interested, I worked around the problem using a closure, which seems a bit cleaner from a coding point of view, although I don't have any idea if it is more efficient or not: I'm trying to use QSignalMapper with my buttons, but I can't seem to get it to work to trigger my slot. Is there any relatively simple way for it? c++; qt; enums;Here is an easy way to get the 3D representation of an object. The overloads are obsolete in Qt 5. QAbstractButton provides most of the states used for buttons: isDown () indicates whether the button is pressed down. Qt’s model/view architecture provides a standard way for views to manipulate information in a data source. 2 [Русский] Qt Core ; QSignalMapper Class 8. In other words (from the documentation): This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters corresponding to. QtCore. A button can be made the default button in a dialog by means of setDefault () and setAutoDefault () . For a more flexible list view widget, use the QListView class with a standard model. Signals (and slots) allow you to connect disparate parts of your application together, making changes in one component trigger behavior in another. QTabBar is straightforward to use; it draws the tabs using one of the predefined shapes, and emits a signal when a tab is selected. Hope this helps grokking QSignalMapper a bit more!QSignalMapper is a wonderful class to organize the work of the signals and slots dynamically created objects. Its been suggested over on the Qt forum to use QSignalMapper, looking into this now. Q&A for work. AboutRole. It does not provide a visual representation of this container (see QGroupBox for a container widget), but instead manages the states of each of the buttons in the group. For any interested, I worked around the problem using a closure, which seems a bit cleaner from a coding point of view, although I don't have any idea if it is more efficient or not:I'm trying to use QSignalMapper with my buttons, but I can't seem to get it to work to trigger my slot. QSignalMapper * mapper = new QSignalMapper (this. 1 Answer. 2 [Русский] Qt Core ; QSignalMapper Class8. 467. 1. 0. If it does not goes well, I recommend to start from mapping one single button first and then just add a loop to map few more. You may have to register before you can post: click the register link above to proceed. __init__ (parent) self. I currently have a qml object keyboard. ViewObject. The only function that we need to implement is the constructor: A list of texts is passed to the constructor. The QSignalMapper is used to re-emit signals with optional parameters. I have a QTreeWidget in which each of its items has a QComboBox in a column. Menu items may be removed with removeAction (). 2. Either connect SIGNAL(finished(void)) to SLOT(HttpImageFinished(void)), or connect SIGNAL(finished(QCustomWidget *)) to. Since your "load" and "return to main menu" signals are being sent from the same sender object they will be mapped the same way. The QWidget class provides the basic capability to render to the screen, and to handle user input events. I have connected it to a slot with a QSignalMapper, and I'm successfully retrieving both the item and the index in the combobox when it is triggered. To get the string id in that slot it is possible to use simple QMap<QProces*, QString> map stored as a Test class member. Use mapped (QWidget*) and change your slot to have the same signature: button_pushed (QWidget*). This class collects a set of parameterless signals, and re-emits them with integer, string or widget parameters. Press Ctrl+a / Ctrl+b to switch between tabs. You shouldn't need to use QSignalMapper with QDialogButtonBox. Jacobs on this Question, and was trying to create an app that will open multiple windows with different parameters, but it doesn't work, looks, like app is opening w. A QSignalMapper object is one that emits a mapped() signal whenever its map() slot is called. It behaves essentially like the above function.